Yup, start the repo Each of the screens for the dungeon will need to be fairly canned or procedural. But of course that's why all the old games are done in dungeons ; )
I can create repo as well, let me know! It's nice to go through the process yourself, it's pretty common these days
A quick intro to Github.
Create a User
I would start by creating a Github user at https://github.com.
Create a new repository
1. In the upper right corner, next to your avatar or identicon, click and then select New repository.
2. Name your repository
3. Write a short description.
4. Select Initialize this repository with a README.
The next step is to decide if others will be working on the project with you as collaborators to the project. There can only be one owner of every repository, but a repository can have many collaborators.
For more information on collaborators see Permission levels for a user account repository.